Undo "Don't include an object header for instructions in the text section."

Undo "Don't include an object header for instructions in the text section."

This undoes most of b2f3e8efe1f32bacad99ddbedbc434a6102d8be2.

This optimization prevents precompiled code from being disabled and re-enabled, because disabling causes the code to lose its only reference to its own instructions. This was okay for precompilated code that ran without a JIT because it is never disabled, but precompiled code that runs in a JIT will become disabled when corresponding optimized code is compiled and re-abled after a deopt.

R=fschneider@google.com

Committed: https://github.com/dart-lang/sdk/commit/f7a3e215a50e232fe60b57a6cdea51cc82636b8b

[rmacnak, 2016-04-28 22:47:49]

Description was changed from

==========
Undo "Don't include an object header for instructions in the text section."

BUG=
==========

to

==========
Undo "Don't include an object header for instructions in the text section."

This undoes most of b2f3e8efe1f32bacad99ddbedbc434a6102d8be2.

This optimization prevents precompiled code from being disabled and re-enabled,
because disabling causes the code to lose its only reference to its own
instructions. This was okay for precompilated code that ran without a JIT
because it is never disabled, but precompiled code that runs in a JIT will
become disabled when corresponding optimized code is compiled and re-abled after
a deopt.
==========

[rmacnak, 2016-04-28 23:32:26]

rmacnak@google.com changed reviewers:
+ fschneider@google.com

[rmacnak, 2016-04-29 22:51:46]

Patchset #4 (id:60001) has been deleted

[rmacnak, 2016-04-29 22:51:52]

Patchset #4 (id:80001) has been deleted

[Florian Schneider, 2016-05-03 08:39:31]

lgtm

[rmacnak, 2016-05-03 18:22:32]

Description was changed from

==========
Undo "Don't include an object header for instructions in the text section."

This undoes most of b2f3e8efe1f32bacad99ddbedbc434a6102d8be2.

This optimization prevents precompiled code from being disabled and re-enabled,
because disabling causes the code to lose its only reference to its own
instructions. This was okay for precompilated code that ran without a JIT
because it is never disabled, but precompiled code that runs in a JIT will
become disabled when corresponding optimized code is compiled and re-abled after
a deopt.
==========

to

==========
Undo "Don't include an object header for instructions in the text section."

This undoes most of b2f3e8efe1f32bacad99ddbedbc434a6102d8be2.

This optimization prevents precompiled code from being disabled and re-enabled,
because disabling causes the code to lose its only reference to its own
instructions. This was okay for precompilated code that ran without a JIT
because it is never disabled, but precompiled code that runs in a JIT will
become disabled when corresponding optimized code is compiled and re-abled after
a deopt.

R=fschneider@google.com

Committed:
https://github.com/dart-lang/sdk/commit/f7a3e215a50e232fe60b57a6cdea51cc82636b8b
==========

[rmacnak, 2016-05-03 18:22:34]

Committed patchset #3 (id:40001) manually as
f7a3e215a50e232fe60b57a6cdea51cc82636b8b (presubmit successful).